KL27 32-PIN UART ROM UPDATE - What pins are mapped?

I have inherited a KL25Z design and I am looking into using the KL27 ROM part instead to make it so that we can download and update inside the product. In looking through the 32 Pin version I see the UART0 can be brought out on many pins.

How do I find which UART pins the ROM boot loader initializes to?

Is there source code for the ROM or is the KL25Z bootloader source the same thing?

I have tried to get the FRDM-KL27Z to talk to the KinetisUpdater by holding down the NMI while resetting with no luck. From the KL25Z Bootloader 1.2.0 source below it appears as if the incorrect pins for ROM boot were selected in designing the FRDM-KL27Z.